On the networking side of things is the return of NVIDIA’s native Gigabit Ethernet, FirstPacket, DualNet and TCP/IP acceleration technologies. These features previously debuted with the nForce 590 SLI and remain the same on the nForce 680i SLI. High definition audio and six SATA 3 Gb/s ports with NVIDIA MediaShield storage technology are supported too. RAID levels 0, 1, 0+1 and 5 are also supported with the nForce 680i SLI.

Targeting budget conscious users are the nForce 650i SLI and 650i Ultra. These chipset are not officially rated to run at 1333 MHz front-side bus, though NVIDIA claims the chipsets can clock beyond official specifications with overclocking. Unlike the nForce 680i SLI, the 650i SLI only supports two PCI Express x16 slots in dual eight lane configurations. These two chipsets are identical with the nForce 650i SLI endowed with SLI support while the 650i Ultra only supports single-graphics card configurations.

The nForce 650i SLI and 650i Ultra have dual-channel DDR2 memory controllers, though there’s no official support for DDR2-1200 or SLI-Ready memory with Enhanced Performance Profiles. It is unknown if motherboard manufacturers will be able to expose the same memory dividers as the ones available on nForce 680i SLI motherboards.

Storage features have been stripped on the nForce 650i SLI and 650i Ultra as well. Instead of the six SATA 3 Gb/s ports found on the nForce 680i SLI, the 650i SLI and 650i Ultra are limited to four SATA 3 Gb/s ports. Nevertheless, NVIDIA’s MediaShield storage technology is still available with support for RAID 0, 1, 0+1 and 5 configurations.

Networking features are also crippled with the nForce 650i SLI and 650i Ultra. Although native Gigabit Ethernet and FirstPacket are supported with the nForce 650i SLI and 650i Ultra, the DualNet and TCP/IP acceleration features are unavailable. As with the nForce 680i SLI, high definition audio technology is supported too.

All nForce 600 series motherboards will support NVIDIA’s nTune utility that allows system tweaking within Windows. The utility allows CPU and memory adjustments in Windows without the need to restart.

NVIDIA is expected to launch in early November with immediate motherboard availability. Expect pricing on nForce 680i SLI motherboards to be north of $200 while nForce 650i SLI and 650i Ultra will fill in the below-$150 price points.

"If you can find a PS3 anywhere in North America that's been on shelves for more than five minutes, I'll give you 1,200 bucks for it." -- SCEA President Jack Tretton